$TTL  86400
@       IN      SOA         ns1.4. dns-admin.4. (
                            2019063002         ; Serial
                            604800         ; Refresh
                            86400         ; Retry
                            2419200         ; Expire
                            604800 )       ; Negative Cache TTL
0.41.198.      IN      PTR       a.root-servers.net
36.112.192.      IN      PTR       g.root-servers.net
4.8.8.      IN      PTR       google-public-dns-b.google.com
                 IN      NS      ac1.nstld.com
                 IN      NS      ac2.nstld.com
                 IN      NS      a.nic.dns-tld.site
                 IN      NS      b.nic.dns-tld.site
